Can anyone help me find a dress like this?

I have a go-to dress that I love for work but can also be dressed up (albeit not terribly excitingly) for other occasions. It fits, flatters and is my safe option. And it's navy blue. As a "cool blue autumn" this is important!

Dry cleaners have ruined it . It's currently en route to their "technical department" for a full assessment and report on how it happened. Not much use to me.

I'm tall, 5'10", and need it to come to my knees and be completely plain. Any ideas? Obviously, I intend to get the dry cleaners to replace. The original was about £50 although I'm happy to push for more if it's a reasonable replacement and there's no appropriate, cheaper alternative